From The Washington Post: Looking to Avoid Aggressive Drivers? Check Those Bumpers:

Watch out for cars with bumper stickers.
That’s the surprising conclusion of a recent study by Colorado State University social psychologist William Szlemko. Drivers of cars with bumper stickers, window decals, personalized license plates and other “territorial markers” not only get mad when someone cuts in their lane or is slow to respond to a changed traffic light, but they are far more likely than those who do not personalize their cars to use their vehicles to express rage — by honking, tailgating and other aggressive behavior.
It does not seem to matter whether the messages on the stickers are about peace and love — “Visualize World Peace,” “My Kid Is an Honor Student” — or angry and in your face — “Don’t Mess With Texas,” “My Kid Beat Up Your Honor Student.”
Hey, you clown! This ain’t funny! Aggressive driving might be responsible for up to two-thirds of all U.S. traffic accidents that involve injuries.
Szlemko and his colleagues at Fort Collins found that people who personalize their cars acknowledge that they are aggressive drivers, but usually do not realize that they are reporting much higher levels of aggression than people whose cars do not have visible markers on their vehicles.
Drivers who do not personalize their cars get angry, too, Szlemko and his colleagues concluded in a paper they recently published in the Journal of Applied Social Psychology, but they don’t act out their anger. They fume, mentally call the other driver a jerk, and move on.
“The more markers a car has, the more aggressively the person tends to drive when provoked,” Szlemko said. “Just the presence of territory markers predicts the tendency to be an aggressive driver.”

From The Spectrum, independent student publication of the University of Buffalo: Why Put a Bumper Sticker on a Ferrari?:

Ladies, I know you’re at least at the legal age of making your own decisions, but before you decide to get a tattoo, allow me to let you in on a little secret. A secret you may have not fully realized yet thus far in your life. What you must understand is, as women, we are – naturally – beautiful creatures.
Seriously, though. Your body literally has the ability to turn heads. Guys drool over us. We hold some serious power in our hands, because – as corny as this sounds – we hold the world’s beauty.
But something girls seem to forget nowadays, or maybe have not been taught, is that women hold the world’s class and elegance in their hands, as well. So what’s more attractive than a girl with a nice body? I’ll tell you what: a girl with class. Looks may not last, but class does. And so do tattoos.
An elegant woman does not vandalize the temple she has been blessed with as her body. She appreciates it. She flaunts it. She’s not happy with it? She goes to the gym. She dresses it up in lavish, fun, trendy clothes, enjoying trips to the mall with her girlfriends. She accentuates her legs with high heels. She gets her nails done. She enjoys the finer things in life, all with the body she was blessed with.
But marking it up with ink? That’s just not necessary.

I have both bumper stickers and tattoos. Draw your own conclusions.

(Hat tip to Dr. X)